Question
A boatman takes 10 hours to travel 360 km downstream and 15 hours to cover the same distance upstream. How much time would it take for the boatman to travel 480 km in still water?
Solution
Downstream speed = 360/10 = 36 km/hour Upstream speed = 360/15 = 24 km/hour So, speed of boatman in still water = (36 + 24)/2 = 30 km/hour Therefore, required time = 480/30 = 16 hours
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